EP1736999A1 - Flexible electrical line - Google Patents

Flexible electrical line Download PDF

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Publication number
EP1736999A1
EP1736999A1 EP05291371A EP05291371A EP1736999A1 EP 1736999 A1 EP1736999 A1 EP 1736999A1 EP 05291371 A EP05291371 A EP 05291371A EP 05291371 A EP05291371 A EP 05291371A EP 1736999 A1 EP1736999 A1 EP 1736999A1
Authority
EP
European Patent Office
Prior art keywords
layer
around
characterized
consists
band
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05291371A
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German (de)
French (fr)
Inventor
Ferdinand Grögl
Thomas Mann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nexans
Original Assignee
Nexans
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Filing date
Publication date
Application filed by Nexans filed Critical Nexans
Priority to EP05291371A priority Critical patent/EP1736999A1/en
Publication of EP1736999A1 publication Critical patent/EP1736999A1/en
Application status is Withdrawn legal-status Critical

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01BCABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00Insulated conductors or cables characterised by their form
    • H01B7/04Flexible cables, conductors, or cords, e.g. trailing cables
    • H01B7/041Flexible cables, conductors, or cords, e.g. trailing cables attached to mobile objects, e.g. portable tools, elevators, mining equipment, hoisting cables

Abstract

The invention relates to a flexible electrical line for supplying power to mobile consumers, which has at least one core (1) which consists of an electrical conductor (2) surrounded by insulation and constructed from a plurality of individual wires. The conductor (2) is surrounded by a first layer (3) of a solid polymer whose wall thickness ensures a prescribed dielectric strength. A second layer (4) of a polymer with a significantly lower dielectric constant than the polymer of the first layer (3) is arranged above the first layer (3), and the second layer (4) is surrounded by an electrically active screen (5). over which a sheath (6) made of insulating material is arranged.

Description

  • The invention relates to a flexible electrical line for the power supply of mobile consumers, which comprises at least one core, each consisting of a surrounded by an insulation, constructed of a plurality of individual wires electrical conductor and which is surrounded by a sheath of insulating material ( DE 36 04 311 A1 ).
  • Lines to which the invention relates are used, for example, in industrial automation as flexible energy supply lines and also as combined lines with power and control wires. Such cables must meet specific electrical requirements, such as bending fatigue strength and abrasion resistance, and electrical specifications. Such a specification is, for example, the smallest possible operating capacity so that on the one hand the line losses and, on the other hand, equalizing currents flowing to ground can be kept small. By "operating capacity" is meant the capacity between the wires of the line on the one hand and between the wires and existing in the line structure shields and ground conductors on the other hand. A small operating capacity is particularly important for long lines with a lying for example over 50 m length of essential.
  • The line after the aforementioned DE 36 04 311 A1 has three cores whose conductors are made of, for example, strands stranded around a tensile core, surrounded by a solid insulation of a natural or synthetic rubber or of a thermoplastic rubber. Over the veins and in the line construction existing protective or monitoring conductors and accessories are an inner sheath made of a crosslinked rubber compound and an outer sheath made of polyurethane attached. In this known line tensile strength elements are available to increase the reliability. An electric screen is not provided. The operating capacity of the line is not mentioned in the specified document.
  • The invention has for its object to make the line described above so that their operating capacity can be kept small without compromising the reliability in a simple manner.
  • This object is achieved according to the invention characterized
    • that the conductor is surrounded by a first layer of a solid polymer whose wall thickness ensures a prescribed dielectric strength,
    • a second layer of a polymer having a significantly lower dielectric constant than the polymer of the first layer is arranged above the first layer, and
    • that the second layer is surrounded by an electrically active screen, over which the jacket is arranged.
  • This line is designed so that it can be used for a given voltage range without restrictions. For this purpose, the insulation of their wires with the conductor surrounding the first layer is dimensioned so that the reliability of the line can be guaranteed. In addition, in the case of this line which is already usable for the power supply of consumers, each core is surrounded by a second layer of a material having a significantly lower dielectric constant than the material of the first layer, which is dimensioned according to predetermined capacitance values. The second layer can be produced in the same operation as the first layer, for example by extrusion or by overlapping winding of strips.
  • The second layer may advantageously contain as much air as possible. This can be achieved by using a foamed insulating material or nonwoven material, the extruded or wound around the first layer. The material of the second layer is mechanically sufficiently stable so that it is not compressed inadmissible, for example, during manufacture of the line and in particular in a line with at least two wires when stranding the same.
  • Embodiments of the subject invention are illustrated in the drawings.
  • Show it:
    • Fig. 1 shows a cross section through a conduit according to the invention with a wire.
    • Fig. 2 shows a cross section through a line with two wires in comparison with FIG. 1 reduced representation.
    • Fig. 3 to 5 cross-sections of three different, compared with FIG. 2 supplemented embodiments of the line with different sized representations.
  • The line according to FIG. 1 has a wire 1 serving for current transmission, which consists of a highly flexible conductor 2, which is surrounded by an insulation composed of two layers, a first layer 3 and a second layer 4. The first layer 3 is applied to the conductor 2 and the second layer 4 surrounds the first layer 3. The conductor 2 can be designed as finely stranded or finest stranded strand or, in particular for larger cross sections, as a stranded rope with correspondingly thin individual wires. The first layer 3 of the insulation consists of a solid polymer, preferably based on polypropylene (PP). However, it is also possible to use a crosslinked polymer, for example polyethylene (PE), or else a fluoropolymer, such as, for example, fluorinated ethylene propylene (FEP) or sintered polytetrafluoroethylene (PTFE). The first layer 3 has a wall thickness which is dimensioned in accordance with the voltage range in which the line is to be used. The dielectric constant (DK) of the materials that can be used for layer 3 is PP and cross-linked PE 2,3 as well as FEP and PTFE 2.1.
  • For lines with an operating voltage of, for example, 1 kV, the following wall thicknesses for layer 3 should apply depending on the cross section of the conductor 2:
    Nominal cross section of the conductor in mm 2 Wall thickness of layer 3 in mm
    par value minimum value
    0.5, 1.0 and 1.5 0.4 0.3
    2.5 and 4.0 0.5 0.4
    6,10 and 16 0.6 0.48
    25 and 35 0.8 0.62
    50 0.9 0.71
  • The second layer 4 of the insulation is applied directly to the first layer 3, preferably by extrusion. However, it can also consist of a band wound around the first layer 3 with overlapping edges. Its dielectric constant is, for example, 1.5 and thus significantly lower than that of the first layer 3. If the second layer 4 is extruded around the first layer 3, the polymer can be added in a known technique to an additive for chemical or physical foaming. It can be used, in particular for thermal reasons, a final cross-linked foamed polymer, such as PE. The wall thickness of the layer 4 is determined as a function of the desired operating capacity and the cross section of the conductor 2. The minimum value of this wall thickness should be 0.3 mm.
  • If, for electrical reasons, smaller wall thicknesses for the layer 4 are to be maintained, then this is advantageously produced by winding. For winding, a polyolefin fiber fleece, for example a polypropylene fleece, having a wall thickness of at least 0.1 mm can be used, which is wound around the first layer 3 as a band with overlapping edges to form the second layer 4. Such a band can also consist of a low-density PTFE with a wall thickness of at least 0.05 mm. The density of this example, as a film PTFE material is between 0.5 g / cm 3 and 0.7 g / cm 3 .
  • Typical DKs of materials usable for the layer 4 are, for example, 1.4 to 1.7 for foamed PP and foamed cross-linked PE, 1.5 for a polypropylene nonwoven and 1.4 for a low-density PTFE.
  • For the purposes of the invention, the first layer 3 and the second layer 4 may, for example, have the following different designs or combinations:
  • As materials for both layers 3 and 4, a polyolefin based on PP can be used. The second layer 4 may consist of a foamed polyolefin extruded around the first layer. The second layer 4 may consist of a polyolefin nonwoven wrapped as a tape with overlapping edges around the first layer. The second layer 4 may consist of a low density PTFE wrapped around the first layer 3 as a band with overcutting edges. The first layer 3 may consist of a cross-linked PE around which the second layer 4 of extruded, foamed polyolefin produced by extrusion is applied. The first layer 3 may consist of a cross-linked PE around which is applied the second layer 4 of cross-linked, foamed PE produced by extrusion. The first layer 3 may consist of a cross-linked PE around which a ribbon of a polyolefin nonwoven having overlapping edges is wound around to form the second layer 4. The first layer 3 may consist of a cross-linked PE, around which as a second layer 4 a band of unsintered low-density PTFE is wound with overlapping strip edges. The first layer 3 may be made of a sintered PTFE around which, as the second layer 4, a band of unsintered low-density PTFE with overlapping edges is wound. The first layer 3 may consist of FEP around which as second layer 4 a ribbon of unsintered low density PTFE with wrapped edges is wrapped.
  • About the wire 1, an electric screen 5 is shown in FIG. 1, which may be constructed in a usual manner for permanently moving lines. Depending on the EMC requirement, it can be single or multi-layered. It can consist of a single-layered structure, for example of a tinned copper wire mesh. In two-layered embodiments, for example, metal foils or metallized plastic nonwovens can be used together with a copper wire mesh or a copper wire stranding. The screen 5 is surrounded by a jacket 6 made of insulating material such as polyurethane.
  • The line of Fig. 2 has two stranded cores 1, the structure of which corresponds to the wire 1 of FIG. They are stranded with two additions 7 and 8, which serve in particular the filling to a circular cross-section. Via wires 1 and 7 and 8, a winding 9 of insulating material is attached, which is surrounded by the screen 5 and the jacket 6. For the winding 9, at least one band of a polyolefin fiber fleece, for example a polypropylene fleece, can be used, which should have a wall thickness of at least 0.1 mm and is wound with overlapping edges.
  • The line in the embodiment of Fig. 3 has three wires 1, which are again constructed the same as the wires 1 of FIG. 1. A fourth wire 10 can serve as a protective conductor. Between the four wires 1 and 10, a tensile element 11 can be centrally arranged. To the cores 1 and 10, an existing plastic inner jacket 12 is extruded around in the illustrated embodiment, which is surrounded by a layer 13 of an insulating material with low DK. For example, an overlapping wound polypropylene fiber nonwoven tape or an overlapping wound low density PTFE tape can be used to make the layer 13. The inner shell 12 may for example consist of a thermoplastic elastomer (TPE). However, it is also possible to use other polymer materials with a DK which is preferably less than 3.
  • Notwithstanding the graphic illustration in FIG. 3, instead of an extruded inner jacket 12, an at least single-layer winding with a band of a polyolefin nonwoven fabric with a lower DK with overlapped wound edges can also be applied. In this case, in order to produce the most possible twisted stranding, the gussets between the strands 1 and 10 can be filled with plastic filling elements (eg polypropylene or PTFE filling yarns), similar to that shown in FIG. Over the layer 13, an electric screen 14 is mounted, whose structure corresponds to that of the screen 5 and which is surrounded by an outer jacket 15 made of insulating material. The attached over the inner shell 12 layer 13 is provided, on the one hand a good lubricity between the inner shell 12 and the screen 14th on the other hand to reduce the partial capacitances between the individual wires 1 and 10 and the screen 14.
  • The line can be constructed according to FIGS. 1 to 3 exclusively as a power supply line. It can also be equipped with additional signal or control wires 16 and 17 as shown in FIG. 4.
  • The three wires 1 of the line of FIG. 4 correspond to those of FIG. 3. The fourth wire 10 is designed as a protective conductor. It may have a green / yellow insulation 18 which may be surrounded by a wound up band 19, for example made of a polypropylene non-woven fabric or of a unsintered low-density PTFE film. The tensile element 11 has a larger cross section in this embodiment of the line. Additional additions or Auffüllelemente 20 serve to supplement the line structure in order to achieve a circular cross-section as possible for the layer 13 as a base. The signal or control cores 16 and 17, as shown in Fig. 4 have an outer insulating layer 21, which again consists of a material with a low DK.
  • In Fig. 5, a line with three wires 1 is shown, the structure of which again corresponds to the wire 1 of FIG. Each wire 1 is surrounded in this embodiment by a concentric protective conductor 22, whose cross section corresponds to one third of the cross section, which is required for the protective conductor of a three-wire line. The entire protective conductor thus consists of three partial protective conductors with a correspondingly smaller cross-section. He meets in this embodiment of the line and the function of the screen 5. Each protective conductor 22 is preferably made of a stranding of copper wire or copper wire. Above the protective conductor 22 is in each case a banding 23 of an overlapped wound metallized plastic fleece attached, which on the one hand serves as a transverse conductor for the copper stranding, but on the other hand also contributes to an improved screening effect in the high-frequency range. With the banding with the metallized plastic fleece over each core 1, a secure conductive connection of the partial protection conductors is ensured with each other.
  • The plastic fleece may consist of polyester in a preferred embodiment. However, other suitable plastics can also be used. For its metallization, a good electrically conductive metal is used, in particular copper. The metal is converted to the molten state for metallization and deposited from the vapor phase on the nonwoven material. In the process, the metal also penetrates into the nonwoven material and envelops the fibers which are held together disorderly there. Overall, a porous, but almost closed metal layer is produced on and in the plastic fleece, which results in a coverage of> 85% for an enclosed object. The three wires 1 are surrounded by a common jacket 24 made of plastic. It consists for example of polyurethane or of a thermoplastic polymer.

Claims (12)

  1. Flexible electrical line for supplying power to mobile consumers, comprising at least one wire consisting of an electrical conductor surrounded by an insulation composed of a plurality of individual wires and surrounded by a jacket of insulating material, characterized
    - That the conductor (2) is surrounded by a first layer (3) of a solid polymer whose wall thickness ensures a prescribed dielectric strength,
    - That above the first layer (3), a second layer (4) made of a polymer having a relation to the polymer of the first layer (3) significantly lower dielectric constant is arranged, and
    - That the second layer (4) by an electrically effective screen (5) is surrounded, over which the jacket (6) is arranged.
  2. Conductor according to claim 1, characterized in that a polyolefin based on polypropylene is used as materials for the two layers (3, 4).
  3. A conduit according to claim 1 or 2, characterized in that the second layer (4) consists of a foamed polyolefin extruded around the first layer (3).
  4. A conduit according to claim 1, characterized in that the second layer (4) consists of a polyolefin fiber nonwoven wrapped as a band with overlapping edges around the first layer (3).
  5. A lead according to claim 1, characterized in that the second layer (4) consists of a low density polytetrafluoroethylene wound as a band with overlapping edges around the first layer (3).
  6. A conduit according to any one of claims 1, characterized in that the first layer (3) consists of a cross-linked polyethylene around which the second layer (4) of extruded, foamed polyolefin produced by extrusion is applied.
  7. A conduit according to any one of claims 1, characterized in that the first layer (3) consists of a cross-linked polyethylene around which the second layer (4) of cross-linked, foamed polyethylene produced by extrusion is applied.
  8. A lead according to any one of claims 1, characterized in that the first layer (3) consists of a cross-linked polyethylene around which a band of polyolefin fiber fleece with overlapping edges is wound around to form the second layer (4).
  9. Conduction according to one of Claims 1, characterized in that the first layer (3) consists of a cross-linked polyethylene around which is wound, as a second layer (4), a band of low-density polytetrafluoroethylene with over-cutting band edges.
  10. Conduction according to one of Claims 1, characterized in that the first layer (3) consists of a sintered polytetrafluoroethylene, around which as second layer (4) a band of unsintered low-density polytetrafluoroethylene with overlapping edges is wound.
  11. Lead according to one of Claims 1, characterized in that the first layer (3) consists of fluoroethylene-propylene, around which is wound, as second layer (4), a band of unsintered low-density polytetrafluoroethylene with overlapping edges.
  12. Cable according to one of Claims 1 to 11, characterized
    - That in a structure with at least two stranded cores (1) each core is surrounded by a concentric protective conductor (22), which is designed as Umseilung of copper wires or copper strands, and
    - That around the protective conductor (22) a band (23) is wound from a penetrating metal-coated plastic fleece with overlapping edges around.
EP05291371A 2005-06-24 2005-06-24 Flexible electrical line Withdrawn EP1736999A1 (en)

Priority Applications (1)

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EP05291371A EP1736999A1 (en) 2005-06-24 2005-06-24 Flexible electrical line

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Application Number Priority Date Filing Date Title
EP05291371A EP1736999A1 (en) 2005-06-24 2005-06-24 Flexible electrical line

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EP1736999A1 true EP1736999A1 (en) 2006-12-27

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EP05291371A Withdrawn EP1736999A1 (en) 2005-06-24 2005-06-24 Flexible electrical line

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2071587A1 (en) * 2007-12-06 2009-06-17 Nexans High power current circuit for non-stationary users
EP2124232A2 (en) 2008-05-20 2009-11-25 Nexans Electrical cable for connecting to mobile consumer loads
CN104733100A (en) * 2015-02-26 2015-06-24 安徽华成电缆有限公司 Low-smoke zero-halogen shielded cable
CN104766653A (en) * 2015-03-25 2015-07-08 安徽幸福电器电缆有限公司 Acid and alkali resisting and corrosion preventing industrial cable

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3604311A1 (en) 1986-02-12 1987-08-13 Kabelmetal Electro Gmbh Multicore electrical power cable
EP1331648A2 (en) * 2002-01-25 2003-07-30 Schlumberger Holdings Limited Electrical cable and method
US20040055780A1 (en) * 2002-07-11 2004-03-25 Susan Hakkarainen Combined suspension cable and electrical conductor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3604311A1 (en) 1986-02-12 1987-08-13 Kabelmetal Electro Gmbh Multicore electrical power cable
EP1331648A2 (en) * 2002-01-25 2003-07-30 Schlumberger Holdings Limited Electrical cable and method
US20040055780A1 (en) * 2002-07-11 2004-03-25 Susan Hakkarainen Combined suspension cable and electrical conductor

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2071587A1 (en) * 2007-12-06 2009-06-17 Nexans High power current circuit for non-stationary users
EP2124232A2 (en) 2008-05-20 2009-11-25 Nexans Electrical cable for connecting to mobile consumer loads
DE102008027933A1 (en) 2008-05-20 2009-11-26 Nexans Electrical conduit for connection to portable consumer
EP2124232A3 (en) * 2008-05-20 2012-02-15 Nexans Electrical cable for connecting to mobile consumer loads
CN104733100A (en) * 2015-02-26 2015-06-24 安徽华成电缆有限公司 Low-smoke zero-halogen shielded cable
CN104766653A (en) * 2015-03-25 2015-07-08 安徽幸福电器电缆有限公司 Acid and alkali resisting and corrosion preventing industrial cable

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